For what you are going to do with it, a .41mag or .44 mag will kill a deer/boar/bear at close range just fine.
The ruger blackhawks are single action,built like a tank,and the most reasonably priced QUALITY handgun you'll find. If you want the option of double action,the redhawk fits the bill perfect,especially the newly introduced 4" version or 5.5" version.